<template lang="">
    <div>
         <!-- 面包屑导航区 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡品视图 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning"
                :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                        v-model="selectedCateKeys"
                        :options="catelist"
                        :props="{ 
                            expandTrigger: 'hover',
                            value: 'cat_id',
                            label: 'cat_name',
                            children: 'children'
                         }"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                    <!-- 添加动态参数的面板 -->
                    <el-tab-pane label="动态参数" name="many">
                        <el-button type="primary" size="mini"
                        :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                        <!-- 动态参数表格 -->
                        <el-table :data="manyTableData" border stripe>
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">
                                        {{item}}
                                    </el-tag>
                                    <!-- 输入的文本框 -->
                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                        >
                                    </el-input>
                                    <!-- 添加按钮  -->
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="参数名称" prop="attr_name">
                            </el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
                    <!-- 添加静态属性的面板 -->
                    <el-tab-pane label="静态属性" name="only">
                        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                         <!-- 静态参数表格 -->
                        <el-table :data="onlyTableData" border stripe>
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">
                                        {{item}}
                                    </el-tag>
                                    <!-- 输入的文本框 -->
                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                        >
                                    </el-input>
                                    <!-- 添加按钮  -->
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="属性名称" prop="attr_name">
                            </el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog
            :title="'添加' + titleText"
            :visible.sync="addDialogVisible"
            width="30%"
            @close="addDialogClose">
            <span>
                <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                    <el-form-item :label="titleText" prop="attr_name">
                        <el-input v-model="addForm.attr_name"></el-input>
                    </el-form-item>
                </el-form>
            </span>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数对话框 -->
        <el-dialog
            :title="'修改' + titleText"
            :visible.sync="editDialogVisible"
            width="30%"
            @close="editDialogClose">
            <span>
                <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                    <el-form-item :label="titleText" prop="attr_name">
                        <el-input v-model="editForm.attr_name"></el-input>
                    </el-form-item>
                </el-form>
            </span>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框，选中的数组
            selectedCateKeys: [],
            // 被激活的页签名称
            activeName: 'many',
            // 动态属性的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            // 控制添加对话框的显示隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 
            addFormRules: {
                attr_name: [
                        { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            // 修改的表单对象
            editForm: {},
            editFormRules: {
                attr_name: [
                        { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
            }

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
            this.catelist = res.data
            console.log(res.data);
        },
        // 级联选择框选中项发生变化，会触发这个函数
        handleChange() {
            // console.log(this.selectedCateKeys);
            this.getParamsData()
        },
        // tab 页签点击事件的处理函数
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
            // 证明选中的不是三级分类
            if (this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return 
            }
            // 证明选中的是三级分类
            // console.log(this.selectedCateKeys);
            // 根据所选分类的id,和当前所处的面板，获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, 
            {
                params: { sel: this.activeName }
            }
            )
            if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
            // console.log(res.data);
            if (this.activeName === 'many') {
                this.manyTableData = res.data
            }
            this.onlyTableData = res.data
            // console.log(res.data);
            // 动态参数及静态属性的展开项
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // console.log(res.data);
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // // 文本框输入的内容
                item.inputValue = ''
            })
        },
        addDialogClose() {
            this.$refs.addFormRef.resetFields()
        },
        // 添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 201) return this.$message.error('添加参数失败')
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.getParamsData()
            })                       
        },
        // 点击按钮显示修改的对话框
        async showEditDialog(attr_id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
            params: { attr_sel: this.activeName }
            })
            if (res.meta.status !== 200) return this.$message.error('获取参数信息失败')
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 重重修改的表单
        editDialogClose() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name, attr_sel: this.activeName
                })
                if (res.meta.status !== 200) return this.$message.error('修改参数失败')
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据id删除参数
        async removeParams(attr_id) {
            const confiremResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            // 用户取消了删除的操作
            if (confiremResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }
            // 删除的业务逻辑
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if (res.meta.status !== 200) return this.$message.error('删除参数失败')
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        // 文本框失去焦点或摁下enter键
        async handleInputConfirm(row) {
            if (row.input.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return 
            }
            // 如果没有return 证明用户输入了内容
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 发起网络请求
            this.saveAttrVals(row)
        },
        // 点击按钮显示输入文本框
        async showInput(row) {
            console.log('===>', this.$refs.saveTagInput);
            row.inputVisible = true
            // // 文本框自动获得焦点
            console.log('=---==>', row.inputVisible);
            this.$nextTick(_ => {
                 this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 将对attr_vals的数据操作保存到数据库
        async saveAttrVals(row){
            // 发起网络请求
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if (res.meta.status !== 200) return this.$message.error('修改参数项失败')
            this.$message.success('修改参数项成功')
        },
        // 删除对应的参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1) // 会修改model层的原数组
            this.saveAttrVals(row)
        }


    },
    computed: {
        // 如果按钮被禁用返回true
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的额三级分类的id
        cateId() {
            if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if (this.activeName === 'many') return '动态参数'
            return '静态属性'
        }
    

    }
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 0 10px;
    }
    .input-new-tag{
        width: 120px;
    }
</style>
